564
AUUS46 KPDT 171225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON AUG 17 2026

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-8 MPH.          NW 3-6 MPH.
TRANSPORT WINDS               SW 6-11 MPH.        W 4-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE AUG 18        GOOD.
OUTLOOK FOR WED AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  57 (POOR).          187 (POOR).
OUTLOOK FOR TUE AUG 18        637 (GOOD).
OUTLOOK FOR WED AUG 19        370 (FAIR).

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 0-5 MPH.          SE 2-6 MPH.
TRANSPORT WINDS               NW 4-9 MPH.         SW 6-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE AUG 18        FAIR.
OUTLOOK FOR WED AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  38 (POOR).          285 (POOR).
OUTLOOK FOR TUE AUG 18        437 (FAIR).
OUTLOOK FOR WED AUG 19        189 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-2 MPH.         NW 3-4 MPH.
TRANSPORT WINDS               N 3-6 MPH.          W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE AUG 18        GOOD.
OUTLOOK FOR WED AUG 19        GOOD.

VENTILATION INDEX (CATEGORY)  34 (POOR).          274 (POOR).
OUTLOOK FOR TUE AUG 18        634 (GOOD).
OUTLOOK FOR WED AUG 19        286 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-7 MPH.          NW 4-7 MPH.
TRANSPORT WINDS               S 5-10 MPH.         NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE AUG 18        GOOD.
OUTLOOK FOR WED AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  48 (POOR).          216 (POOR).
OUTLOOK FOR TUE AUG 18        647 (GOOD).
OUTLOOK FOR WED AUG 19        362 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      294 (POOR)
ELLENSBURG    267 (POOR)
GOLDENDALE    343 (FAIR)
TRI-CITIES    138 (POOR)
WALLA WALLA   179 (POOR)
YAKIMA        345 (FAIR)
BEND          292 (POOR)
PRINEVILLE    433 (FAIR)
ENTERPRISE    292 (POOR)
HERMISTON     166 (POOR)
JOHN DAY      633 (GOOD)
LA GRANDE     283 (POOR)
MADRAS        303 (FAIR)
MEACHAM       255 (POOR)
PENDLETON     208 (POOR)
REDMOND       372 (FAIR)
SENECA       1049 (GOOD)
THE DALLES    317 (FAIR)

METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS.  BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.

THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS.  A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$